<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .tab ul {
            overflow: hidden;
            padding: 0;
            margin: 0;
        }
        
        .tab ul li {
            box-sizing: border-box;
            padding: 0;
            float: left;
            width: 100px;
            height: 45px;
            line-height: 45px;
            list-style: none;
            text-align: center;
            border-top: 1px solid blue;
            border-right: 1px solid blue;
        }
        
        .tab ul li:first-child {
            border-left: 1px solid blue;
        }
        
        .tab ul li.active {
            background-color: orange;
        }
        
        .tab div {
            width: 500px;
            height: 300px;
            display: none;
            text-align: center;
            font-size: 30px;
            line-height: 300px;
            border: 1px solid blue;
            border-top: 0px;
        }
        
        .tab div.current {
            display: block;
        }
        
        .tab ul li:hover {
            background-color: pink;
        }
    </style>
    <script src="../../vue.js"></script>
</head>

<body>
    <div id="app">
        <div class="tab">
            <ul>
                <li @click='change(index)' :class='currentIndex === index ? "active":"" ' :key=' item.id ' v-for='(item,index) in list '>
                    {{item.title}}
                </li>
            </ul>
            <div :class='currentIndex=== index ? "current": "" ' :key=' item.id ' v-for='(item,index) in list '>
                <img :src="item.url" :alt="item.title">
            </div>
        </div>
    </div>

    <script>
        var vm = new Vue({
            el: '#app ',
            data: {
                currentIndex: 0,
                list: [{
                    id: 1,
                    title: '苹果 ',
                    url: './images/apple.png '
                }, {
                    id: 2,
                    title: '橘子 ',
                    url: './images/orange.png '
                }, {
                    id: 3,
                    title: '柠檬 ',
                    url: './images/lemon.png '
                }]
            },
            methods: {
                change(index) {
                    this.currentIndex = index
                }
            }
        });
    </script>
</body>

</html>